Copper-catalyzed highly efficient ester formation from carboxylic acids/esters and formates
作者:Jun Liu、Changdong Shao、Yanghui Zhang、Guangfa Shi、Shulei Pan
DOI:10.1039/c4ob00193a
日期:——
A highly efficient copper-catalyzed protocol for the synthesis of esters has been developed from formates. This protocol is applicable to reactions with either esters or acids as the substrates, and shows broad substrate scopes and high yields.
[EN] METHODS AND COMPOSITIONS FOR MODULATING SPHINGOSINE-1-PHOSPHATE (S1P) RECEPTOR ACTIVITY<br/>[FR] PROCEDES ET COMPOSITIONS SERVANT A MODULER L'ACTIVITE DU RECEPTEUR DE LA SPHINGOSINE-1-PHOSPHATE (S1P)
申请人:PRAECIS PHARM INC
公开号:WO2006020951A1
公开(公告)日:2006-02-23
The present invention relates to compounds which modulate the activity of the SI P1 receptor, the use of these compounds for treating conditions associated with signaling through the S1 P1 receptor, and pharmaceutical compositions comprising these compounds.
Carboxyl Activation of 2-Mercapto-4,6-dimethylpyrimidine through N-Acyl-4,6-dimethylpyrimidine-2-thione: A Chemical and Spectrophotometric Investigation
作者:M.P. Rajan
DOI:10.14233/ajchem.2015.17607
日期:——
discovery of coupling reagents which gave an unprecedented impeteus to the development of peptide synthesis. Of course, in these methods high reactivity of carboxyl function towards nucleophilic attack is achieved, but rigorous conditions such as use of base, temperature etc. are required. Moreover, the electron withdrawing groups like halogen which enhances the electrophilicity of carboxyl carbon, increases
COMPOSITIONS AND METHODS FOR STABILIZING INGREDIENTS USING 2,4-PENTANEDIONE COMPOUNDS
申请人:Chaudhuri Ratan K.
公开号:US20120141395A1
公开(公告)日:2012-06-07
Benzylidene substituted 2,4-pentanedione compounds without having phenolic hydroxyl group(s) are found to provide photostability to otherwise photosensitive compounds and compositions.
METHODS FOR PHOTOSTABILIZING INGREDIENTS WITHIN COSMETICS, PERSONAL CARE AND HOUSEHOLD PRODUCTS AND COMPOSITIONS OBTAINED THEREFROM
申请人:Chaudhuri Ratan K.
公开号:US20080131381A1
公开(公告)日:2008-06-05
The present invention relates to methods and compositions for using photostabilizer compounds for stabilizing formulation ingredients, like flavors, fragrances, colors, antioxidants, polymers, within cosmetics, personal care and household products, against degradation from sun light, heat and air oxidation resulting in improvement in storage stability, viscosity, and maintenance of color of the formulated products.